-void set_context_opts(void *ctx, void *opts_ctx, int flags, AVCodec *codec);
+/**
+ * Filter out options for given codec.
+ *
+ * Create a new options dictionary containing only the options from
+ * opts which apply to the codec with ID codec_id.
+ *
+ * @param encoder if non-zero the codec is an encoder, otherwise is a decoder
+ * @return a pointer to the created dictionary
+ */
+AVDictionary *filter_codec_opts(AVDictionary *opts, enum CodecID codec_id, int encoder);
+
+/**
+ * Setup AVCodecContext options for avformat_find_stream_info().
+ *
+ * Create an array of dictionaries, one dictionary for each stream
+ * contained in s.
+ * Each dictionary will contain the options from codec_opts which can
+ * be applied to the corresponding stream codec context.
+ *
+ * @return pointer to the created array of dictionaries, NULL if it
+ * cannot be created
+ */
+AVDictionary **setup_find_stream_info_opts(AVFormatContext *s, AVDictionary *codec_opts);